Sunny, Solo Partner is an excellent book and you'll discover the "dance" that you both participate in, i.e., the distancer/pursuer one. You will need to learn how to remain steady when she is doing the "dance" w/you. When she distances, do not pursue her. She needs to feel the "loss" of your company and attention in order to come back around once again. It's very similiar to the moth and the attraction of a candle.
Enjoy your time away and I hope that you are able to talk to your son every day. I wouldn't worry to much about her being angry...she'll get over it in due time. It's her way of punishing you and you do not want to fall into that little guilty trap.
Look forward to hearing how your time away has been. Enjoy!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.